- tepid
- c.1400, from L. tepidus "lukewarm," from tepere "be warm," from PIE base *tep- "warm" (cf. Skt. tapati "makes warm, heats, burns," tapah "heat;" Avestan tafnush "fever;" O.C.S. topiti "to warm," teplu "warm;" O.Ir. tene "fire;" Welsh tes "heat").